Have you tried http://drupal.org/project/mollom or http://drupal.org/project/akismet?

Hans

2008/8/20 Shyamala Rajaram <shyamala@netlinkindia.com>
We are facing currently comment spamming from a particular IP. As a security step we enabled Captcha and banned the IP. But the problem still persits, and the user is accessing the comment from a new IP every time. Though the comments do not get generated, it's still clogging the database. We need help to resolve this security issue.
 
Shyamala

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Hans Rossel
KOBA Webdevelopment
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